Herschel/SPIRE 250 μm image with the high-density filaments (N(H2) >2.7×1021 cm-2) overlaid in cyan (crest) and red (strands). Low-density filaments or striations (N(H2) < 1.8 ×1021 cm-2) as traced by getfilaments are indicated in green (Sect. 2.2). Equatorial north-east directions are indicated by the compass (corresponding to a rotation of 55° counter-clockwise with respect to north is up). The angular and spatial scales are indicated by the horizontal line in the bottom panel: 10′ is equivalent to 0.58 pc.
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